1ISWALNUM(3)                Linux Programmer's Manual               ISWALNUM(3)
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NAME

6       iswalnum - test for alphanumeric wide character
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SYNOPSIS

9       #include <wctype.h>
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11       int iswalnum(wint_t wc);
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DESCRIPTION

14       The  iswalnum()  function is the wide-character equivalent of the isal‐
15       num(3) function.  It tests whether wc is a wide character belonging  to
16       the wide-character class "alnum".
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18       The  wide-character  class  "alnum" is a subclass of the wide-character
19       class "graph", and therefore also  a  subclass  of  the  wide-character
20       class "print".
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22       Being  a subclass of the wide-character class "print", the wide-charac‐
23       ter class "alnum" is disjoint from the wide-character class "cntrl".
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25       Being a subclass of the wide-character class "graph", the  wide-charac‐
26       ter class "alnum" is disjoint from the wide-character class "space" and
27       its subclass "blank".
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29       The wide-character class "alnum" is disjoint  from  the  wide-character
30       class "punct".
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32       The  wide-character  class  "alnum"  is the union of the wide-character
33       classes "alpha" and "digit".  As such, it also contains the  wide-char‐
34       acter class "xdigit".
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36       The  wide-character  class "alnum" always contains at least the letters
37       'A' to 'Z', 'a' to 'z' and the digits '0' to '9'.
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RETURN VALUE

40       The iswalnum() function returns nonzero if wc is a wide  character  be‐
41       longing  to  the  wide-character  class "alnum".  Otherwise, it returns
42       zero.
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ATTRIBUTES

45       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
46       tributes(7).
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48       ┌─────────────────────────────────────┬───────────────┬────────────────┐
49       │Interface                            │ Attribute     │ Value          │
50       ├─────────────────────────────────────┼───────────────┼────────────────┤
51       │iswalnum()                           │ Thread safety │ MT-Safe locale │
52       └─────────────────────────────────────┴───────────────┴────────────────┘
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CONFORMING TO

55       POSIX.1-2001, POSIX.1-2008, C99.
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NOTES

58       The behavior of iswalnum() depends on the LC_CTYPE category of the cur‐
59       rent locale.
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SEE ALSO

62       isalnum(3), iswctype(3)
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COLOPHON

65       This page is part of release 5.12 of the Linux  man-pages  project.   A
66       description  of  the project, information about reporting bugs, and the
67       latest    version    of    this    page,    can     be     found     at
68       https://www.kernel.org/doc/man-pages/.
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72GNU                               2021-03-22                       ISWALNUM(3)
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